Vegetation (Floating River Vegetation) - Office of Public Works

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Absence of floating river vegetation during summer months due to excess shading River Breagagh Winter 2006 River Breagagh Summer 2006 Corresponding points in summer and winter 50
River Breagagh Winter 2006 Ranunclion growth during summer not affecting winter water flow Corresponding points in summer and winter Fig. 10 Effect of floating river vegetation growth on winter water flow on the River Breagagh (Site 5) survey site. Water crowfoot adjacent to the weir does not appear to interfere with winter flow. Further upstream the eroded riverbank that supported water parsnip is totally submerged. Its location is illustrated by a series of vortices evident on the water surface. An alternative situation is occurring on the bend of the river, the area supporting the water crowfoot during the summer months is depicted as an area of minimal energy flow. Whether the vegetation has adapted to a section on the river where the flow has differed due to some environmental dynamic or that the vegetation has exerted a regime on the water flow is not entirely clear. It is likely that a difference in flow dynamic has enabled the colonisation of floating river vegetation and consequently the presence of the plant growth is facilitating further change in the surrounding environment (Fig. 10) which, if unmaintained would result in silt build-up and replacement by different plant species over time. In 51
Page 1 and 2:
ISSN 1649 - 9840 SERIES OF ECOLOGIC
Page 3 and 4:
Foreword This Ecological Impact Ass
Page 5 and 6: Executive Summary Table of Contents
Page 7 and 8: 1.0 Introduction This study was com
Page 9 and 10: and fauna. The OPW has a multi-annu
Page 11 and 12: Currently twenty-one Special Areas
Page 13 and 14: 2.1.4 Lower River Shannon Special A
Page 15 and 16: 2.2.4 Site elevations within the Lo
Page 17 and 18: 2.3.4 Site integrity of the Lower R
Page 19 and 20: 3.0 Ecological Assessment of Water
Page 21 and 22: 3.2 Distribution and extent of floa
Page 23 and 24: 3.2.1 Floating river vegetation of
Page 25 and 26: aquatic moss. 3.2.3 Floating river
Page 27 and 28: 3.2.5 Floating river vegetation wit
Page 29 and 30: Starwort, Callitriche species •Ro
Page 31 and 32: Each form of reproduction requires
Page 33 and 34: prevented aquatic growth. Water lev
Page 35 and 36: G.densa was the dominant floating r
Page 37 and 38: 4.0 Description of maintenance oper
Page 39 and 40: consultation with the Foreman / Tec
Page 41 and 42: 4.3 River corridor water dynamics A
Page 43 and 44: Not shown in the above data set is
Page 45 and 46: 4.4 Physical, chemical and biologic
Page 47 and 48: •Survey watercourses to determine
Page 49 and 50: The primary riverbed substrate of w
Page 51 and 52: gravel require loosening assess the
Page 53 and 54: • Livestock should be restricted
Page 55: River Breagagh Winter 2006 River Br
Page 59 and 60: 6.0 Conclusion and summary •Arter
Page 61 and 62: References •Blamey, M., Fritter,
Page 63 and 64: Appendix A - Special Areas of Conse
Page 65 and 66: Lower River Shannon Special Areas o
Page 67 and 68: Channel name Location coordinates E
Page 69 and 70: Appendix C - Habitat classification
Page 71 and 72: Lower River Shannon Special Area of
Page 73 and 74: Lough Corrib Special Area of Conser
Page 75 and 76: 7 Lower River Suir Special Area of
Page 77 and 78: C1 Lower River Shannon Special Area
Page 79 and 80: 6 C1/12/2 C1/18/1/1 /14/7/3 C/20/1
Page 81 and 82: Appendix E - Physical parameters re
Page 83 and 84: River Barrow and River Nore Special
Page 85 and 86: Latin Name English Name Appendix F
Page 87 and 88: Latin Name English Name Potamogeton
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Vegetation (Floating River Vegetation) - Office of Public Works

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